read function for StreamCipher

[Roy Kipp]

A read function would be useful for the StreamCipher. Something like the following:

    def read(self, n):
        """Return n bytes from the stream.
        """
        if n < 0:
            raise ValueError("number of stream bytes needs to be >= 0")
        newpos = self._pos + n
        stream = self._h.digest(self._pos, newpos)
        self._pos = newpos
        return stream

[Hagen (hagenf)]

Good idea. I had thought that RandomBytes.read() would serve that purpose, but its stream is not independent of the sizes of the chunks you read. Therefore I added a method like the one you proposed as StreamCipher.keystream().

In the process of doing this, I found and fixed two bugs, a minor one and a more serious one. Everything is in the repository now and I'll probably cut a new release 0.7.1 for this soon.

[Roy Kipp (roy-kipp)]

The fix/feature provided in 0.7.1 works great - thanks